I thought I had read here before that the 1312 number indicated that it was for a 3:54 rear axle ? I have not ever checked it against anything. I did not direct Palo Alto to do any mods and I do not think the subject of rear axle ratio ever came up when I had it in for repair. I have always assumed it was a 3:54 but besides the speedometer have not tried to look at any markings etc on the pumpkin in many years. I am running on 205/70/15 tires.
David
68 E-type FHC